Set Appliance State:

Mains Power Off
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Observation:

Allow boiler to cool so temperature is below 45°C.
When cool turn on DHW tap.
Reset boiler by putting selector switch to standby then turn back on.
Does boiler attempt the ignition process or go straight to lockout?